Semrush has one of the strongest affiliate programs in the digital marketing space right now. Semrush is an SEO and marketing tool used by millions of people, and their affiliate program pays recurring commissions, meaning you earn money every month a person you referred keeps their subscription active. GetResponse and ActiveCampaign, which are email marketing platforms, also run solid programs with good commission rates. The marketing software space works well for affiliates because people who buy these tools tend to stick with them for a long time. What do you think makes a software affiliate program worth promoting over a one-time commission product?